CN102130724A - Light automatic gain control circuit used for cable TV network optical receiver - Google Patents
Light automatic gain control circuit used for cable TV network optical receiver Download PDFInfo
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Abstract
The invention relates to a light automatic gain control circuit used for a cable television network optical receiver, belonging to the technical field of cable televisions. The circuit comprises a detector, a biasing circuit, a first amplifying circuit, an electrical modulation attenuation circuit, a second amplifying circuit, an optical power detection circuit, a comparison circuit, a D/A (Digital to Analog) conversion circuit and an optical power indication circuit, wherein the optical detector is connected with the biasing circuit, the optical power detection circuit and an optical input signal; the first amplifying circuit is connected with the biasing circuit and the electrical modulation attenuation circuit; the second amplifying circuit is connected with the electrical modulation attenuation circuit and used for outputting a ratio frequency signal; the D/A conversion circuit is connected with the electrical modulation attenuation circuit, the optical power indication circuit and the comparison circuit; and the comparison circuit is connected with the optical power indication circuit and the optical power detection circuit. The circuit has the advantages that the circuit can guarantee that the television signal of users is normal; network transformation can be carried out on the premise of basically not considering the optical power to achieve the purpose of fibre-optical to the home; the network structure is simple; and passive transmission can be realized.
Description
Technical field
The present invention relates to a kind of light-operated automatic gain control (AGC AutomaticGain Control) circuit that is applied to cable television network optical receiver, belong to the cable TV technical field, especially the transformation of hybrid fiber coax bilateral network is a kind of based on the cable TV optical transmission device.
Background technology
To the end of the year 2009, national wired broadcasting TV user reaches 1.74 hundred million families.On January 13rd, 2010, Premier Wen Jiabao's formal proposition in the Executive Meeting of the State Council of holding accelerates to advance China Telecom's net, broadcasting and television network and the Internet integration of three networks, and the clear and definite timetable of the integration of three networks.On June 6th, 2010, China has passed through integration of three networks pilot scheme, and has determined 12 experimental cities and area July 1.After the integration of three networks realized, broadcasting and television network not only can provide TV programme, and the Internet and voice communication service can also be provided.For the Internet and communication network, also can develop business such as Web TV, mobile TV better, share the abundant program resource of broadcasting and television network.It is basic transmission network transformation that SARFT(The State Administration of Radio and Television) requires one of hybrid fiber/ coax, HFC (HFC) bilateral network transformation, and basic realization Fiber-To-The-Building is wherein arranged, and realizes that progressively Fiber to the home.Along with the continuous upgrading and the transformation of hfc plant, fiber optic network replaces coaxial cable rapidly with cheap price, wider coverage, transmission speed and littler failure rate faster.Optical sender and optical receiver just become key equipment in the network in hfc plant like this, and here I just develop the light control automatic gain control circuit that a ultralow luminous power receives cable television network optical receiver according to the development of CHINA RFTCOM Co Ltd of new generation.
Summary of the invention
The objective of the invention is to provide a kind of light automatic gain control circuit that is used for cable television network optical receiver, it can guarantee that user's TV signal is normal, can carry out the network rebuilding under the prerequisite of not considering luminous power substantially, and realization optical fiber is registered one's residence, the network architecture is simple, and network is realized passive transmission.
The objective of the invention is to reach like this, a kind of light automatic gain control circuit that is used for cable television network optical receiver, it is characterized in that: comprise photodetector, biasing circuit, first amplifying circuit, electricity is transferred attenuator circuit, second amplifying circuit, the luminous power testing circuit, comparison circuit, D/A change-over circuit and luminous power indicating circuit, optical fiber passes through the flange input optical signal to photodetector, photodetector and biasing circuit, the luminous power testing circuit is connected with light input signal, first amplifying circuit and biasing circuit, electricity transfers attenuator circuit to connect, second amplifying circuit transfer attenuator circuit to be connected with electricity and with export radiofrequency signal, the D/A change-over circuit is transferred attenuator circuit with electricity, the luminous power indicating circuit is connected with comparison circuit, and comparison circuit is connected with the luminous power testing circuit with the luminous power indicating circuit.
Biasing circuit of the present invention comprises inductance L 2, signal coupler Z1, capacitor C 5～C7, resistance R 3～R5,1 pin of one termination photodetector of inductance L 2, inductance L 2 another termination signal coupler Z1 inputs, one end of signal coupler Z1 output connecting resistance R4 and capacitor C 7, signal coupler Z1 mixes termination first amplifying circuit, one end of resistance R 4 other end connecting resistance R3, R5 and capacitor C 5, one termination direct voltage+24V of resistance R 5 other ends, capacitor C 6, capacitor C 5, C6, C7, resistance R 3 other end common grounds.
First amplifying circuit of the present invention comprises capacitor C 3, C4, C8～C10, inductance L 3, L4, resistance R 6, amplifier tube A1, wherein amplifier tube A1 is the F226 of OEI company, the signal coupler Z1 of one termination biasing circuit of capacitor C 3 mixes end, 1 pin of capacitor C 3 another termination amplifier tube A1 and an end of capacitor C 4,2 pin of amplifier tube A1 connect an end of capacitor C 8 and inductance L 4, one end of inductance L 4 another termination capacitor C 9 and resistance R 6, one end of resistance R 6 another termination direct voltage+8V and capacitor C 10, one end of capacitor C 8 another termination inductance L 3, another termination electricity of inductance L 3 is transferred attenuator circuit, capacitor C 4, C9,3 of the other end of C10 and amplifier tube A1,4 pin common grounds.
Electricity of the present invention transfers attenuator circuit to comprise inductance L 5, capacitor C 11～C15, C17, resistance R 7～R14, double diode D1, D2, one end of resistance R 9 and 3 pin of double diode D1 connect first amplifying circuit, direct voltage+24V connects capacitor C 11, one end of resistance R 7, resistance R 7 other end connecting resistance R10, R11, one end of R12 and capacitor C 14, resistance R 10 another termination capacitor C 12, one end of resistance R 8 and 1 pin of double diode D1, resistance R 12 another termination capacitor C 15, one end of resistance R 13 and 1 pin of double diode D2,2 pin of double diode D1 connect 2 pin of double diode D2 and an end of inductance L 5, an end and second amplifying circuit of the 3 pin connecting resistance R14 of double diode D2, one end of inductance L 5 another termination capacitor C 13, one end of capacitor C 17 and A point, the A point meets D/A change-over circuit, capacitor C 11-C15, the other end of C17, resistance R 8, R9, R11, R13, the R14 common ground.
Second amplifying circuit of the present invention comprises capacitor C 16, C18～C21, inductance L 6, resistance R 15, amplifier tube A2, attenuator ATT1, wherein amplifier tube A2 is the F226 of OEI company, the one termination electricity of capacitor C 16 is transferred attenuator circuit, 1 pin of capacitor C 16 another termination amplifier tube A2,2 pin of amplifier tube A2 connect an end of capacitor C 19 and inductance L 6, the input of capacitor C 19 another termination attenuator ATT1, the output output radiofrequency signal of attenuator ATT1, an another termination capacitor C 18 of inductance L 6 and an end of resistance R 15, resistance R 15 another termination direct voltage+8V, the end of capacitor C 20 and C21, capacitor C 18, C20,3 of the other end of C21 and amplifier tube A2,4 pin common grounds.
Luminous power testing circuit of the present invention comprises inductance L 1, resistance R 1, R2, capacitor C 1, C2, one termination photodetector, 2 pin of inductance L 1, one end of inductance L 1 other end connecting resistance R1, R2, capacitor C 1, one end of resistance R 1 another termination capacitor C 2 and B point, the B point connects comparison circuit, capacitor C 1, C2, resistance R 2 other end common grounds.
Comparison circuit of the present invention comprises capacitor C 26, C27, resistance R 47～R57, amplifier LM1～LM3, one end of capacitor C 27,2 of amplifier LM1,6 pin, 2 of LM2,6,9,13 pin, 2 of LM3,6,9, the B point of 13 pin connects the luminous power testing circuit, the 3 pin connecting resistance R47 of amplifier LM1, the end of R48,12 pin of resistance R 48 another termination amplifier LM2 and an end of resistance R 49,10 pin of resistance R 49 another termination amplifier LM2 and an end of resistance R 50,12 pin of resistance R 50 another termination amplifier LM3 and an end of resistance R 51,10 pin of resistance R 51 another termination amplifier LM3 and an end of resistance R 52, one end of resistance R 52 another termination direct voltage+24V and capacitor C 26,8 pin of amplifier LM1,4 pin of LM2,4 pin of LM3 meet direct voltage+24V, 5 pin of resistance R 47 another termination amplifier LM1 and an end of resistance R 53,3 pin of resistance R 53 another termination amplifier LM2 and an end of resistance R 54,5 pin of resistance R 54 another termination amplifier LM2 and an end of resistance R 55,3 pin of resistance R 55 another termination amplifier LM3 and an end of resistance R 56,5 pin of resistance R 56 another termination amplifier LM3 and an end of resistance R 57,4 pin of amplifier LM1,11 pin of LM2, the 11 pin ground connection of LM3, capacitor C 27 other end ground connection, 1 pin of amplifier LM1 connects the positive pole of diode D8 and the positive pole of light-emitting diode D18,7 pin of amplifier LM1 connect the positive pole of diode D13 and the positive pole of light-emitting diode D23,1 pin of amplifier LM2 connects the positive pole of diode D12 and the positive pole of light-emitting diode D22,7 pin of amplifier LM2 connect the positive pole of diode D11 and the positive pole of light-emitting diode D21,8 pin of amplifier LM2 connect the positive pole of diode D6 and the positive pole of light-emitting diode D16,14 pin of amplifier LM2 connect the positive pole of diode D7 and the positive pole of light-emitting diode D17,1 pin of amplifier LM3 connects the positive pole of diode D10 and the positive pole of light-emitting diode D20,7 pin of amplifier LM3 connect the positive pole of diode D9 and the positive pole of light-emitting diode D19,8 pin of amplifier LM3 connect the positive pole of diode D4 and the positive pole of light-emitting diode D14, the positive pole of the 14 pin diode D5 of amplifier LM3 connects the positive pole with light-emitting diode D15, positive pole by diode D4-D13 is connected with the D/A change-over circuit, positive pole by light-emitting diode D14-D23 is connected capacitor C 26 with the luminous power indicating circuit, the other end of C27, the other end common ground of resistance R 57.
D/A change-over circuit of the present invention comprises capacitor C 22, C23, resistance R 16～R36, voltage-stabiliser tube D3, diode D4～D13, the positive pole of diode D4～D13 is connected with the luminous power indicating circuit with comparison circuit, the negative pole of diode D4～D13 is connecting resistance R27～R36 one end respectively, the other end of resistance R 27～R36 is the end of connecting resistance R17～R26 respectively, resistance R 17～R26 other end, one end of resistance R 16, one end of capacitor C 22, the negative pole of voltage-stabiliser tube D3 connects the A point, the A point connects the A point that electricity is transferred attenuator circuit, one end of resistance R 16 another termination capacitor C 23, capacitor C 22, the anodal common ground of the C23 other end and voltage-stabiliser tube D3.
Luminous power indicating circuit of the present invention comprises capacitor C 24, C25, resistance R 37～R46, light-emitting diode D14～D23, the positive pole of light-emitting diode D14～D23 is connected with the D/A change-over circuit with comparison circuit, the negative pole of light-emitting diode D14～D23 is the end of connecting resistance R37～R46 respectively, the end of another termination direct voltage+8V of resistance R 37～R46 and capacitor C 24, C25, capacitor C 24, C25 other end ground connection.
The present invention has used the high sensitivity photodetector, when input optical power during at-5dBm, can guarantee that user's TV signal is normal.Input photodetector luminous power-8～+ during 2dBm, keep output level invariable, when carrying out network design,, can under the prerequisite of not considering luminous power substantially, carry out the network rebuilding according to the requirement of network output level.Adopted accurate luminous power indicating circuit, show that luminous power deixis circuit has accurately played the effect of light power meter, can directly read current received optical power, have great importance for system maintenance, especially for the user who does not have light power meter, there is the luminous power indicative significance extraordinary.Make full use of existing network, optical fiber is extended to user side, EPON is transparent fully to signal transfer protocol, format modulation signal, network can be expanded according to the growth of customer volume, the user needs higher quality requirement really from now on, can be directly optic fibre extension to the user, realize that real optical fiber registers one's residence.Network using optical fiber, network configuration are very simple, have significantly reduced the active electronic equipment between front end and user, as light station and amplifier, do not need open-air power supply, and the AC backup of power is added up RF PON network according to operator and can be reduced by 90% maintenance than hfc plant.Equipment and number of fibers significantly reduce, and the network architecture is simple and clear, and network is realized passive transmission.
Description of drawings
Fig. 1 is a block diagram of the present invention.
Fig. 2 is a schematic diagram of the present invention.
Embodiment
Referring to Fig. 1, a kind of light control automatic gain control circuit that is used for cable television network optical receiver, comprise photodetector by the biasing circuit output signal of telecommunication to first amplifying circuit, transfer attenuator circuit by electricity, through second amplifying circuit output radiofrequency signal.And the photodetector output voltage connects electricity accent attenuator circuit through luminous power testing circuit, comparison circuit, D/A change-over circuit successively, and comparison circuit is exported another road and given the luminous power indicating circuit, finishes AGC control.
Referring to Fig. 2, photodetector of the present invention is electrooptical device PIN pipe, and to photodetector, 1 pin of photodetector connects biasing circuit to optical fiber by the flange input optical signal, and 2 pin of photodetector connect the luminous power testing circuit, 3 pin ground connection of photodetector.The light automatic gain control circuit that is used for cable television network optical receiver be in certain light receiving power scope (8～+ 2dBm), the signal of telecommunication of photodetector output is transferred attenuator circuit, invariable radiofrequency signal output of second amplifying circuit output through biasing circuit, first amplifying circuit, electricity, the D/A change-over circuit control electricity of leading up to of comparison circuit is transferred attenuator circuit, and another road of comparison circuit shows the optical power intensity of current reception by the luminous power indicating circuit.+ 24V direct voltage is through capacitor C 11, C6, resistance R 5, capacitor C 5, resistance R 3, R4, capacitor C 7, signal coupler Z1, inductance L 2 input photodetectors 1 pin, photodetector work, by 1 pin of the photodetector 1 pin output signal of telecommunication through inductance L 2, signal coupler Z1, capacitor C 3, C4 input amplifier tube A1, + 8V direct voltage is input to 2 pin of amplifier tube A1 through capacitor C 10, resistance R 6, capacitor C 9, inductance L 4, amplifier tube A1 work, the signal of telecommunication that 2 pin of amplifier tube A1 amplify is through 3 pin of capacitor C 8, inductance L 3, resistance R 9 input double diode D1; Photodetector 2 pin output voltages, through the luminous power testing circuit that inductance L 1, resistance R 1, R2, capacitor C 1, C2 are formed, output voltage through the B point to comparison circuit; Capacitor C 26, C27, resistance R 47～R57, amplifier LM1～LM3 form comparison circuit, and one the tunnel outputs to the D/A change-over circuit, and another road outputs to the luminous power indicating circuit; Capacitor C 22, C23, voltage-stabiliser tube D3, diode D4～D13, resistance R 16～R36 form the D/A change-over circuit and transfer attenuator circuit through A point control electricity; Light-emitting diode D14～D23, resistance R 37～R46, capacitor C 24, C25 form the luminous power indicating circuit, show current received optical power intensity; The D/A change-over circuit controls voltage to the electricity of being made up of inductance L 5, capacitor C 12～C15, C17, double diode D1, D2, resistance R 7～R14 through the output of A point and transfers attenuator circuit; The 3 pin output signal of telecommunication of double diode D2 is through 1 pin of resistance R 14, capacitor C 16 input amplifier tube A2, + 8V direct voltage is through 2 pin of capacitor C 21, electrochemical capacitor C20, resistance R 15, capacitor C 18, inductance L 6 input amplifier tube A2, amplifier tube A2 work, the signal of telecommunication that 2 pin of amplifier tube A2 amplify is through capacitor C 19, the output of attenuator ATT1 output radiofrequency signal.A1 wherein, A2 is the low noise amplifier tube F226 of OEI company, Z1 is the signal coupling coil, LM1～LM3 is an operational amplifier, D1, D2 is a staged decay double diode, D3 is a voltage-stabiliser tube, D4～D13 is a diode, D14～D23 is a light-emitting diode, ATT1 is fixed attenuator, L4, L5 is a High frequency filter direct current overcurrent inductance, and L1～L3 adjusts air core inductor for the signal flatness, and C4 is a signal flatness control capacittance, C17 is a tantalum electric capacity, C20 is an electrochemical capacitor, C3, C8, C16, C19 is the high frequency capacitance, C1, C2, C5～C7, C9～C15, C17, C18, C21～C27 is a high-frequency filter capacitor, R9, R14 is an impedance matching resistance, R2, R3, R8, R11, R13, R57 is a dropping resistor, R1, R4～R7, R10, R12, R15～R56 is a current-limiting resistance.
The most attractive benefit of the present invention is to reduce the network operation cost.When disposing solution, its following points technical advantage:
1. ultralow luminous power receives: conventional photodetector input optical power-when 3dBm was following, carrier-to-noise ratio (C/N) can sharply descend, and causes user's TV signal mosaic to occur.The light automatic gain control circuit has used the high sensitivity photodetector, when input optical power during at-5dBm, can guarantee that user's TV signal is normal.
2. output level is invariable: conventional optical receiver input optical power changes 1dBm, the output signal of telecommunication can change 2dB, the light automatic gain control circuit input optical power-8～+ during 2dBm, pass through internal control circuit, can keep output level invariable, when carrying out network design,, can under the prerequisite of not considering luminous power substantially, carry out the network rebuilding according to the requirement of network output level.
3. luminous power indication: conventional optical receiver has only simple luminous power indication, can't correctly judge current received optical power.The light automatic gain control circuit has adopted accurate luminous power indicating circuit, show that luminous power deixis circuit has accurately played the effect of light power meter, can directly read current received optical power, have great importance for system maintenance, especially for the user who does not have light power meter, there is the luminous power indicative significance extraordinary.
4. cost is relatively low, be convenient to upgrade expanding: make full use of existing network, optical fiber is extended to user side, EPON is transparent fully to signal transfer protocol, format modulation signal, network can be expanded according to the growth of customer volume, the user needs higher quality requirement really from now on, can be directly optic fibre extension to the user, realize that real optical fiber registers one's residence.
5. fail safe, reliability height, maintainable good: network using optical fiber, network configuration is very simple, between front end and user, significantly reduced the active electronic equipment, as light station and amplifier, do not need open-air power supply, the AC backup of power is added up RF PON network according to operator and can be reduced by 90% maintenance than hfc plant.Equipment and number of fibers significantly reduce, and the network architecture is simple and clear, and network is realized passive transmission.
Claims (9)
1. light automatic gain control circuit that is used for cable television network optical receiver, it is characterized in that: comprise photodetector, biasing circuit, first amplifying circuit, electricity is transferred attenuator circuit, second amplifying circuit, the luminous power testing circuit, comparison circuit, D/A change-over circuit and luminous power indicating circuit, photodetector and biasing circuit, the luminous power testing circuit is connected with light input signal, first amplifying circuit and biasing circuit, electricity transfers attenuator circuit to connect, second amplifying circuit transfer attenuator circuit to be connected with electricity and with export radiofrequency signal, the D/A change-over circuit is transferred attenuator circuit with electricity, the luminous power indicating circuit is connected with comparison circuit, and comparison circuit is connected with the luminous power testing circuit with the luminous power indicating circuit.
2. the light automatic gain control circuit that is used for cable television network optical receiver according to claim 1, it is characterized in that described biasing circuit comprises inductance L 2, signal coupler Z1, capacitor C 5～C7, resistance R 3～R5,1 pin of one termination photodetector of inductance L 2, inductance L 2 another termination signal coupler Z1 inputs, one end of signal coupler Z1 output connecting resistance R4 and capacitor C 7, signal coupler Z1 mixes termination first amplifying circuit, resistance R 4 other end connecting resistance R3, one end of R5 and capacitor C 5, resistance R 5 other ends, one termination direct voltage+24V of capacitor C 6, capacitor C 5, C6, C7, resistance R 3 other end common grounds.
3. the light automatic gain control circuit that is used for cable television network optical receiver according to claim 1, it is characterized in that described first amplifying circuit comprises capacitor C 3, C4, C8～C10, inductance L 3, L4, resistance R 6, amplifier tube A1, wherein amplifier tube A1 is the F226 of OEI company, the signal coupler Z1 of one termination biasing circuit of capacitor C 3 mixes end, 1 pin of capacitor C 3 another termination amplifier tube A1 and an end of capacitor C 4,2 pin of amplifier tube A1 connect an end of capacitor C 8 and inductance L 4, one end of inductance L 4 another termination capacitor C 9 and resistance R 6, one end of resistance R 6 another termination direct voltage+8V and capacitor C 10, one end of capacitor C 8 another termination inductance L 3, another termination electricity of inductance L 3 is transferred attenuator circuit, capacitor C 4, C9,3 of the other end of C10 and amplifier tube A1,4 pin common grounds.
4. the light automatic gain control circuit that is used for cable television network optical receiver according to claim 1, it is characterized in that described electricity accent attenuator circuit comprises inductance L 5, capacitor C 11～C15, C17, resistance R 7～R14, double diode D1, D2, one end of resistance R 9 and 3 pin of double diode D1 connect first amplifying circuit, direct voltage+24V connects capacitor C 11, one end of resistance R 7, resistance R 7 other end connecting resistance R10, R11, one end of R12 and capacitor C 14, resistance R 10 another termination capacitor C 12, one end of resistance R 8 and 1 pin of double diode D1, resistance R 12 another termination capacitor C 15, one end of resistance R 13 and 1 pin of double diode D2,2 pin of double diode D1 connect 2 pin of double diode D2 and an end of inductance L 5, an end and second amplifying circuit of the 3 pin connecting resistance R14 of double diode D2, one end of inductance L 5 another termination capacitor C 13, one end of capacitor C 17 and A point, the A point meets D/A change-over circuit, capacitor C 11-C15, the other end of C17, resistance R 8, R9, R11, R13, the R14 common ground.
5. the light automatic gain control circuit that is used for cable television network optical receiver according to claim 1, it is characterized in that described second amplifying circuit comprises capacitor C 16, C18～C21, inductance L 6, resistance R 15, amplifier tube A2, attenuator ATT1, wherein amplifier tube A2 is the F226 of OEI company, the one termination electricity of capacitor C 16 is transferred attenuator circuit, 1 pin of capacitor C 16 another termination amplifier tube A2,2 pin of amplifier tube A2 connect an end of capacitor C 19 and inductance L 6, the input of capacitor C 19 another termination attenuator ATT1, the output output radiofrequency signal of attenuator ATT1, an another termination capacitor C 18 of inductance L 6 and an end of resistance R 15, resistance R 15 another termination direct voltage+8V, the end of capacitor C 20 and C21, capacitor C 18, C20,3 of the other end of C21 and amplifier tube A2,4 pin common grounds.
6. the light automatic gain control circuit that is used for cable television network optical receiver according to claim 1, it is characterized in that described luminous power testing circuit comprises inductance L 1, resistance R 1, R2, capacitor C 1, C2, one termination photodetector, 2 pin of inductance L 1, one end of inductance L 1 other end connecting resistance R1, R2, capacitor C 1, one end of resistance R 1 another termination capacitor C 2 and B point, the B point connects comparison circuit, capacitor C 1, C2, resistance R 2 other end common grounds.
7. the light automatic gain control circuit that is used for cable television network optical receiver according to claim 1, it is characterized in that described comparison circuit comprises capacitor C 26, C27, resistance R 47～R57, amplifier LM1～LM3, one end of capacitor C 27,2 of amplifier LM1,6 pin, 2 of LM2,6,9,13 pin, 2 of LM3,6,9, the B point of 13 pin connects the luminous power testing circuit, the 3 pin connecting resistance R47 of amplifier LM1, the end of R48,12 pin of resistance R 48 another termination amplifier LM2 and an end of resistance R 49,10 pin of resistance R 49 another termination amplifier LM2 and an end of resistance R 50,12 pin of resistance R 50 another termination amplifier LM3 and an end of resistance R 51,10 pin of resistance R 51 another termination amplifier LM3 and an end of resistance R 52, one end of resistance R 52 another termination direct voltage+24V and capacitor C 26,8 pin of amplifier LM1,4 pin of LM2,4 pin of LM3 meet direct voltage+24V, 5 pin of resistance R 47 another termination amplifier LM1 and an end of resistance R 53,3 pin of resistance R 53 another termination amplifier LM2 and an end of resistance R 54,5 pin of resistance R 54 another termination amplifier LM2 and an end of resistance R 55,3 pin of resistance R 55 another termination amplifier LM3 and an end of resistance R 56,5 pin of resistance R 56 another termination amplifier LM3 and an end of resistance R 57,4 pin of amplifier LM1,11 pin of LM2, the 11 pin ground connection of LM3, capacitor C 27 other end ground connection, 1 pin of amplifier LM1 connects the positive pole of diode D8 and the positive pole of light-emitting diode D18,7 pin of amplifier LM1 connect the positive pole of diode D13 and the positive pole of light-emitting diode D23,1 pin of amplifier LM2 connects the positive pole of diode D12 and the positive pole of light-emitting diode D22,7 pin of amplifier LM2 connect the positive pole of diode D11 and the positive pole of light-emitting diode D21,8 pin of amplifier LM2 connect the positive pole of diode D6 and the positive pole of light-emitting diode D16,14 pin of amplifier LM2 connect the positive pole of diode D7 and the positive pole of light-emitting diode D17,1 pin of amplifier LM3 connects the positive pole of diode D10 and the positive pole of light-emitting diode D20,7 pin of amplifier LM3 connect the positive pole of diode D9 and the positive pole of light-emitting diode D19,8 pin of amplifier LM3 connect the positive pole of diode D4 and the positive pole of light-emitting diode D14, the positive pole of the 14 pin diode D5 of amplifier LM3 connects the positive pole with light-emitting diode D15, positive pole by diode D4-D13 is connected with the D/A change-over circuit, positive pole by light-emitting diode D14-D23 is connected capacitor C 26 with the luminous power indicating circuit, the other end of C27, the other end common ground of resistance R 57.
8. the light automatic gain control circuit that is used for cable television network optical receiver according to claim 1, it is characterized in that described D/A change-over circuit comprises capacitor C 22, C23, resistance R 16～R36, voltage-stabiliser tube D3, diode D4～D13, the positive pole of diode D4～D13 is connected with the luminous power indicating circuit with comparison circuit, the negative pole of diode D4～D13 is connecting resistance R27～R36 one end respectively, the other end of resistance R 27～R36 is the end of connecting resistance R17～R26 respectively, resistance R 17～R26 other end, one end of resistance R 16, one end of capacitor C 22, the negative pole of voltage-stabiliser tube D3 connects the A point, the A point connects the A point that electricity is transferred attenuator circuit, one end of resistance R 16 another termination capacitor C 23, capacitor C 22, the anodal common ground of the C23 other end and voltage-stabiliser tube D3.
9. the light automatic gain control circuit that is used for cable television network optical receiver according to claim 1, it is characterized in that described luminous power indicating circuit comprises capacitor C 24, C25, resistance R 37～R46, light-emitting diode D14～D23, the positive pole of light-emitting diode D14～D23 is connected with the D/A change-over circuit with comparison circuit, the negative pole of light-emitting diode D14～D23 is the end of connecting resistance R37～R46 respectively, the end of another termination direct voltage+8V of resistance R 37～R46 and capacitor C 24, C25, capacitor C 24, C25 other end ground connection.
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| CN201010617758.1A CN102130724B (en) | 2010-12-30 | 2010-12-30 | Light automatic gain control circuit used for cable TV network optical receiver |
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| CN201010617758.1A CN102130724B (en) | 2010-12-30 | 2010-12-30 | Light automatic gain control circuit used for cable TV network optical receiver |
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| CN102130724A true CN102130724A (en) | 2011-07-20 |
| CN102130724B CN102130724B (en) | 2014-01-15 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104506244A (en) * | 2014-12-25 | 2015-04-08 | 四川璧虹广播电视新技术有限公司 | AGC (automatic gain control) control circuit for management type household optical receiving machine |
| CN104506242A (en) * | 2014-12-25 | 2015-04-08 | 四川璧虹广播电视新技术有限公司 | AGC (automatic gain control) control method for management type household optical receiving machine |
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| CN101478344A (en) * | 2008-12-04 | 2009-07-08 | 上海大学 | Light control automatic gain control circuit applied on cable television network optical receiver |
| CN201947276U (en) * | 2010-12-30 | 2011-08-24 | 常熟市高事达光电科技有限公司 | Automatic optical gain control circuit for cable television network optical receiver |
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2010
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| US4205269A (en) * | 1977-06-09 | 1980-05-27 | Hochiki Corporation | Remote control variable attenuation device for an antenna amplifier |
| CN101478344A (en) * | 2008-12-04 | 2009-07-08 | 上海大学 | Light control automatic gain control circuit applied on cable television network optical receiver |
| CN201947276U (en) * | 2010-12-30 | 2011-08-24 | 常熟市高事达光电科技有限公司 | Automatic optical gain control circuit for cable television network optical receiver |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104506244A (en) * | 2014-12-25 | 2015-04-08 | 四川璧虹广播电视新技术有限公司 | AGC (automatic gain control) control circuit for management type household optical receiving machine |
| CN104506242A (en) * | 2014-12-25 | 2015-04-08 | 四川璧虹广播电视新技术有限公司 | AGC (automatic gain control) control method for management type household optical receiving machine |
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| Publication number | Publication date |
|---|---|
| CN102130724B (en) | 2014-01-15 |
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Address after: 215532 Jiangsu city of Suzhou province Changshou City ancient town Baimao Industrial Zone Patentee after: Suzhou gaoshida information Polytron Technologies Inc Address before: The ancient town of Jiangsu province 215532 Changshou City Baimao Economic Development Zone Patentee before: Changshu Gaoshida Optoelectronic Technology Co., Ltd. |
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